Support Center

What is a winmail.dat file? An Outlook TNEF container that can hold a message and its attachments. Read the full explanation →

How do I open one on iPhone or iPad? Share the attachment to Winmail File Viewer. See the five steps →

Can I open one without the app? You can read the message free in the browser viewer; attachments need the iOS app. Open the online viewer →

Can I save the attachments? Saving and sharing require a subscription or credits in the iOS app; message viewing is free. See app features and pricing →

Does it upload my file? No. Decoding runs on your device. Read the privacy policy →

How do I cancel a subscription? Go to Settings → [Your Name] → Subscriptions → Winmail File Viewer. Manage subscriptions →

Still stuck? Contact our support team and we will reply within 24 hours. Contact support →